<scp> <scp>Nb</scp> </scp> ‐Modified 0.9 <scp> <scp>BaTiO</scp> </scp> ₃ –0.1( <scp> <scp>Bi</scp> </scp> _0.5 <scp> <scp>Na</scp> </scp> _0.5 ) <scp> <scp>TiO</scp> </scp> ₃ Ceramics for <scp>X</scp> 9 <scp>R</scp> High‐Temperature Dielectrics Application Prepared by Coating Method

Abstract

0.9 BaTiO 3 –0.1 Bi 0.5 Na 0.5 TiO 3 ‐based (0.9 BT –0.1 BNT ) ceramics with T c = 180°C were prepared using a novel chemical coating method. The relationships among compositions, microstructures, and properties were investigated. TEM morphologies displayed the Nb ‐coated powders, which were confirmed by energy dispersive spectroscopy ( EDS ). Temperature‐dependence of permittivity for Nb ‐modified 0.9 BT –0.1 BNT ceramics measured at different frequencies showed no relaxor characteristic at high temperature, but frequency dispersion at low temperature. The microstructures were characterized by two types of grains: Nb ‐rich grains and Nb ‐free grains, which were responsible for temperature‐stable dielectric properties. The sample with 5 mol% Nb addition satisfied the X 9 R specification. The permittivity was 1934 and the dissipation factor was 1.53% at room temperature.